Columbo

A sex therapist catches her boyfriend with another woman when he thinks she is out of town. She then disguises herself and manages to kill him while in disguise, not realizing that a potential suitor saw her enter the bathroom as a dark-haired woman and exit as a blonde.

Stewart J. Zully, Dave Florek, Peter Wise, Peter Jurasik, Ken Lerner, Stephen Macht, Harry Johnson, Leeza Vinnichenko, Susan Gibney, Lindsay Crouse, Julia Montgomery, Marge Redmond, Pierrino Mascarino, Michele Lamar Richards